Re: [Rpcemu] Mode 1920x1200 in Generic not showing up

@Tony: thanks a lot!  I tried to change the bandwidth value manually,  but it had no effect. Setting it as default on startup is a better idea!
Ok, tried to change upon startup, but again, no effect.  I'll check the mdf timing values and older posts, too, thanks for the reference.

Uwe

---- Tony Moore schrieb ----

I sent this an hour ago but so far nothing has come back.
Apologies if you have alredy seen it.

On 2 Aug 2016, Uwe <uwe@familie-kall.de> wrote:
> ---- Tony Moore schrieb ----
> > On 2 Aug 2016, Uwe <uwe@familie-kall.de> wrote:
> >
> > > Hi can anyone tell me why this mode is not available in the mode
> > > selection? (Version 0.8.12)
> >
> > You need a 1920x1200 Mode Definition File. Google found one at

[snip]

> > I've no idea if it will work, but it's worth trying. The location of
> > the MDF files in !Boot depends on the RO version (which you don't
> > mention).

> @Tony: thanks for the answer - the mode is already part of the
> 'generic' mdf, but does not show up in the mode selection anyhow (I
> use the vanilla RiscOS 5 Version of rpcemu, sorry I didn't tell).

The problem has been discussed before
http://www.riscos.info/pipermail/rpcemu/2013-August/002081.html

Using RO 5.20, the Generic MDF is at
!Boot.Resources.Configure.Monitors.Other.Generic . It contains data for
22 modes but, here, only 13 of them appear in the Resolution menu.

The 1920x1200 59 Hz mode has a pixel rate of 154000 kHz which, at 32
bpp, implies a bandwidth of 4928 Mb/sec (if my arithmetic is correct).
This is greater than the VIDCBandLimit of 2000 Mb/sec which is set by
!Boot.Choices.Boot.PreDesk.Configure.!Run , so the mode is absent from
the Resolution menu.

Reducing the pixel rate to 62000 kHz allows the 1920x1200 mode to appear
on the Resolution menu but, of course, its frame rate will be greatly
reduced. I can't test it because my laptop screen is not large enough.

Since VIDCBandLimit is not relevant for an emulated system, its value
can be increased (I don't know the actual limit) allowing the bandwidth
to exceed 2000 Mb/sec. You may need to compromise between VIDCBandLimit
and pixel rate.

Perhaps someone who is using RPCEmu with a 1920x1200 screen can help?

Tony




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